Improvement in machines for reducing diameter of metal tubes



3 Sheets-$heet 1* S. P. M. TASKER. MACHINES FOR REDUGING AMETER 0F METALjTUBES.

No.17'5,5ZZ. Patented March 28,1876.

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N4 PEIERS. PHOTO-UTHOGRAPHER WASHINGTON n C BSheets-SheetL S. P. M. TASKER. MACHINES FOR REDUCING DIAMETER OFVMETAL TUBES N 175,5ZZ, Patented March 28,1876.

' A I fix v MACHINES FOR REDUCING DIAMETER 0F METAL TUBES.

No.1'75,522. Patented March 28,1876.

JNITED S'rA'rEs PATENT OFFroE.

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

' IMPROVEMENT lN MACHINES FOR REDUCING DIAMETER 0F METAL TUBES.

Specification forming part of Letters Patent No. 175,522, dated March 28, 1876; application filed February 23, 1876.

To all whom it may concern:

Be it known that 1, STEPHEN P. M. TAS- KER, of the city and county of Philadelphia, in the State of Pennsylvania, have invented a new and useful Improvement in Machines for Reducing the Diameter of Metal Tubes, which is fully set forth in the following specification, reference being had to the accompanying drawings.

The nature of my invention consists of two or more sets of grooved rolls, in which the grooves of each succeeding set is of- (liminished size to that of the preceding set, whereby the diameter of the tube is gradually (liminished as it passes through the rolls. The rolls in each succeeding set are so arranged in relation to the last preceding set as to have the parts of the tube between the points of contact of the grooves covered .by the grooves of the succeeding rolls, so as to have all parts of the circumference of the tube pressed upon by the rolls as uniformly as possible. I-arrange three or more rolls in each set, it being desirable to have as many as can be conveniently used, as uniformity of pressure is thereby secured and I prefer having an odd number in each set, in order to have thedrivingwheels all in the same plane, and for convenience of connecting the whole train with spur gearing.

As the tube is diminished in size it is gradually elongated, and consequently the speed of each succeeding set of rolls should be increased over that of the preceding set.

As the bearing of the rolls is evenly distributed upon the circumference of the tube, the use of a mandrel may be dispensed with.

Appropriate guides are used for conducting the tube to the dilferent sets of rolls.

' In the accompanying drawings, Figure 1 is a plan view of my improved machine. Fig. 2 is a longitudinal section takenat the line as m of Fig. 1. Fig. 3, Sheet No. 2, is a crosssection taken at the line y 3 of Fig. 1, showing the arrangement of the set of rolls A, A and A Fig. 4 is a like view taken at the line 22 of Fig. 1, showing the arrangement of the set of rolls 0, O and C Fig.

-5 is a face view of one of the guides F. Figs.

6 and 7 are end views of the same.

Like letters otreference in all the figures iurangement of the rolls in each set in respect to each other, and the arrangement of a succeeding set in relation to the next precediugset. The rolls A, A and A shown clear ly in Fig. 3, are of equal diameter, and have grooves a a a, which meet each other, to form the circumference of the tube as it passes through this set of rolls; The diameter of the opening 1) formed by the grooves should be somewhat smaller than the tube which enters the rolls to commence the reducing of the size of the tube. The shafts B, B and B and those of the succeeding sets of rolls, are supported by any suitable frame-work. O, 0 and G are a set of rolls on the shafts D, D, and D seen in detail in Fig. 4. The grooves a a a of these rolls are of such curvature as to form the opening I) of smaller size than the opening 1) between the rolls A, A, and A for further reducing the size of the tube. The shafts G, G, and 0 of the second set of rolls are so arranged in relation to the shafts B, B and B of the first set as to make the pressure of the rolls cover the lines where the pressure of the first set of rolls meet each other, whereby to produce an equal pressure on the whole circumference of the tube, as seen in Figs. 3 and 4.

I have shown in the drawings but two sets of rolls as an illustration; but it will be understood that any. desirable number of sets may be used, according to the amount the tubes are to be reduced.

For conducting the tube to each set of rolls are guides F, one of which is shown detached from the machine in Figs. 5, 6, and 7.

The gearwheels are placed on the horizontal shafts B and D and corresponding shafts of any desirable number 01' sets of rolls, the wheels of the whole train gearing into each other.

I claim as my invention- The combination of two or more sets of rolls, graduated in size for reducing the size of the tube, each set consisting ofthree or more rolls, and so arranged that the rolls of a succeeding set shall press upon those parts of the tube between the pressure of the preceding rolls, substantially as and for the purpose set forth.

STEPHEN P. M. TASKER.

Witnesses:

STEPHEN USTICK, THOMAS J. BEWLEYQ 

